Metered Dose InhalersNebulizers and VaporizersDry Powder InhalersAdministration, InhalationBronchodilator AgentsChlorofluorocarbonsAerosol PropellantsAerosolsPowdersAlbuterolFenoterolBeclomethasoneAnti-Asthmatic AgentsAsthmaInhalation SpacersIpratropiumEquipment DesignTerbutalineHydrocarbons, FluorinatedBudesonidePeak Expiratory Flow RateRespiratory System AgentsPulmonary Disease, Chronic ObstructivePregnenedionesAdrenergic beta-AgonistsForced Expiratory VolumeChlorofluorocarbons, MethaneHoarsenessEthanolaminesAtropine DerivativesCross-Over StudiesDouble-Blind MethodCromolyn SodiumAndrostadienesParticle SizeDrug Delivery SystemsVital CapacityLungTreatment OutcomeTechnology Assessment, BiomedicalTechnetiumLung Diseases, ObstructivePregnadienediolsTechnology, PharmaceuticalBiological AvailabilityChemistry, PharmaceuticalRespiratory TherapyGlucocorticoidsDrug Administration ScheduleHydrocortisoneAnti-Inflammatory AgentsRandomized Controlled Trials as TopicScopolamine DerivativesAdrenal Cortex HormonesBronchiDrug CombinationsDose-Response Relationship, DrugPatient Education as TopicDevice ApprovalTherapeutic EquivalencyAdrenergic beta-2 Receptor AgonistsPatient Compliance